Laws Of Motion Question 376
Question: A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of 25 N. The bird (mass m = 0.5 kg) flies upward in the cage with an acceleration of $ 2m/s^{2} $ . The spring balance will now record a weight of [MP PMT 1999]
Options:
A) 24 N
B) 25 N
C) 26 N
D) 27 N
Show Answer
Answer:
Correct Answer: B
Solution:
Since the cage is closed and we can treat bird, cage and the air as a closed (isolated) system. In this condition the force applied by the bird on cage is an internal force, due to this the reading of spring balance will remain the same.
BETA
